Two Year Xinjiang Trial Lifts Cotton Yield 13.31% With Microbial Fertilizer Mix

A two-year field experiment in Xinjiang has found that a microbial fertilizer and potassium fulvic acid treatment raised cotton yield by 13.31 percent under the trial’s saline-alkali conditions. The peer-reviewed study, published in Scientific Reports on October 1, tested seven treatments in a randomized block design with three replicates during the 2023 and 2024 seasons at the 29th Regiment of Tiemenguan City.

The best-performing yield treatment combined 120 liters per hectare of a compound microbial fertilizer with 15 liters per hectare of potassium fulvic acid. The microbial product contained Lactobacillus acidophilus and Corynebacterium glutamicum. Researchers reported the 13.31 percent yield increase against the study’s H comparison treatment, identified in the paper’s abstract as the fulvic-acid-only control. That distinction matters because the result does not represent a comparison with an entirely input-free field.

More input did not produce the highest final yield. A larger dose of 150 liters per hectare of microbial fertilizer, also paired with 15 liters per hectare of potassium fulvic acid, produced the highest seedling emergence rate at 85 percent. Yet its yield increase was only 3.97 percent. The authors interpret the divergence as evidence that stronger early emergence does not automatically translate into more bolls, heavier bolls or better reproductive performance.

The highest-dose treatment produced the clearest changes in soil chemistry. Relative to the H comparison, it reduced pH by 0.12 units, lowered water-soluble salts by 12.5 percent in the top 20 centimeters and by 10.8 percent at 20 to 40 centimeters, and reduced chloride and sodium concentrations by 18.3 percent and 15.6 percent. The tested field began with a pH of 8.11 and more than 10 grams of water-soluble salt per kilogram of soil, making this a trial in severely saline conditions rather than an average cotton field.

Sequencing results suggest the treatment changed the rhizosphere selectively instead of producing a uniform expansion of all microbes. Bacterial diversity remained relatively stable, while fungal richness and diversity increased more clearly. The paper reports higher relative abundance of fungi including Pseudeurotium and Mortierella in the better-performing treatments, but those associations do not by themselves prove that the fungal shifts caused the yield gain.

The experimental design strengthens the finding but also limits how widely it can be applied. The work covered two seasons, one Xinjiang location, one locally cultivated cotton variety and three replicated plots per treatment. Irrigation, basal fertilizer and crop management were held constant across plots, helping isolate the treatment effect, but the study did not establish whether the same rate would be economic or agronomically optimal in other soils, climates or cotton systems.

For producers managing saline-alkali land, the practical signal is not simply that more microbial fertilizer is better. The intermediate rate delivered the highest yield, while the highest rate delivered the strongest emergence and salt reduction. Any commercial decision would therefore need to compare product cost with the value of additional lint or seed cotton and account for local soil salinity, irrigation water quality, existing fertility and the consistency of the response across seasons.

The study adds field evidence to the expanding market for biological soil inputs, but it should be treated as a location-specific production result rather than a universal recommendation. Multi-location trials with more seasons, additional varieties and a full untreated benchmark are needed before the 120-liter rate can be promoted broadly. For now, the strongest conclusion is that a carefully chosen microbial fertilizer and fulvic acid combination improved both cotton yield and several soil indicators in this specific saline Xinjiang system.